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A crash attenuator for protecting a truck or stationary structure from damage resulting from impact of an object such as a vehicle including a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive an impact from an object in a crash, a movabl

A crash attenuator for protecting a truck or stationary structure from damage resulting from impact of an object such as a vehicle including a frame mountable to a truck or stationary structure, a bumper having an impact-receiving face adapted to receive an impact from an object in a crash, a movable displacement structure coupled to the frame and interposed between the frame and the bumper and having a first position in which the bumper is relatively distant from the frame and a second position in which the bumper is relatively proximate to the frame, and an energy dissipation system coupled to the displacement structure for dissipating the impact energy of the object into the bumper which causes said displacement structure to be moved from the first position toward the second position.

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[I claim:] [1.]a frame mountable to a truck or stationary structure,a bumper having an impact-receiving face adapted to receive the impact from the object in a crash,a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position i

[I claim:] [1.]a frame mountable to a truck or stationary structure,a bumper having an impact-receiving face adapted to receive the impact from the object in a crash,a movable displacement structure coupled to said frame and interposed between said frame and said bumper and having a first position in which said bumper is relatively distant from said frame and a second position in which said bumper is relatively proximate to said frame,energy dissipation means coupled to said displacement structure for dissipating the impact energy of the object received by said bumper which causes said displacement structure to be moved from the first position toward the second position and thereby reducing the velocity of the object, anddeceleration sensing means coupled to said energy dissipation means for sensing the deceleration of the object after impact with said bumper,said energy dissipation means being arranged to provide an energy dissipation force for dissipating the impact energy of the object based on the sensed deceleration of the object.